I have witnessed the same thing in our labs where they work in groups. Most of our students believe it's enough to hand in a sheet with stuff written on it even though they have no idea what it means or how to get the answers them selves. Also, We have tried a small verion of this with something called Self Studey. They are assigned chapters and questions are asked about that material during quizes. I would say it's a fair estimate if 1 in 100 actually do the reading.
This stuff sounds great on paper but I have not… >>>